-/*
- * SECTION: ioctl functions.
- */
-static struct list_head dasd_ioctl_list = LIST_HEAD_INIT(dasd_ioctl_list);
-
-/*
- * Find the ioctl with number no.
- */
-static struct dasd_ioctl *
-dasd_find_ioctl(int no)
-{
- struct dasd_ioctl *ioctl;
-
- list_for_each_entry (ioctl, &dasd_ioctl_list, list)
- if (ioctl->no == no)
- return ioctl;
- return NULL;
-}
-
-/*
- * Register ioctl with number no.
- */
-int
-dasd_ioctl_no_register(struct module *owner, int no, dasd_ioctl_fn_t handler)
-{
- struct dasd_ioctl *new;
- if (dasd_find_ioctl(no))
- return -EBUSY;
- new = kmalloc(sizeof (struct dasd_ioctl), GFP_KERNEL);
- if (new == NULL)
- return -ENOMEM;
- new->owner = owner;
- new->no = no;
- new->handler = handler;
- list_add(&new->list, &dasd_ioctl_list);
- return 0;
-}
-
-/*
- * Deregister ioctl with number no.
- */
-int
-dasd_ioctl_no_unregister(struct module *owner, int no, dasd_ioctl_fn_t handler)
-{
- struct dasd_ioctl *old = dasd_find_ioctl(no);
- if (old == NULL)
- return -ENOENT;
- if (old->no != no || old->handler != handler || owner != old->owner)
- return -EINVAL;
- list_del(&old->list);
- kfree(old);
- return 0;
-}
-
-int
-dasd_ioctl(struct inode *inp, struct file *filp,
- unsigned int no, unsigned long data)
-{
- struct block_device *bdev = inp->i_bdev;
- struct dasd_device *device = bdev->bd_disk->private_data;
- struct dasd_ioctl *ioctl;
- const char *dir;
- int rc;
-
- if ((_IOC_DIR(no) != _IOC_NONE) && (data == 0)) {
- PRINT_DEBUG("empty data ptr");
- return -EINVAL;
- }
- dir = _IOC_DIR (no) == _IOC_NONE ? "0" :
- _IOC_DIR (no) == _IOC_READ ? "r" :
- _IOC_DIR (no) == _IOC_WRITE ? "w" :
- _IOC_DIR (no) == (_IOC_READ | _IOC_WRITE) ? "rw" : "u";
- DBF_DEV_EVENT(DBF_DEBUG, device,
- "ioctl 0x%08x %s'0x%x'%d(%d) with data %8lx", no,
- dir, _IOC_TYPE(no), _IOC_NR(no), _IOC_SIZE(no), data);
- /* Search for ioctl no in the ioctl list. */
- list_for_each_entry(ioctl, &dasd_ioctl_list, list) {
- if (ioctl->no == no) {
- /* Found a matching ioctl. Call it. */
- if (!try_module_get(ioctl->owner))
- continue;
- rc = ioctl->handler(bdev, no, data);
- module_put(ioctl->owner);
- return rc;
- }
- }
- /* No ioctl with number no. */
- DBF_DEV_EVENT(DBF_INFO, device,
- "unknown ioctl 0x%08x=%s'0x%x'%d(%d) data %8lx", no,
- dir, _IOC_TYPE(no), _IOC_NR(no), _IOC_SIZE(no), data);
- return -EINVAL;
-}